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Method for detecting mixed oil on basis of terahertz optical rotation effects

A detection method and terahertz technology, applied in the measurement of color/spectral characteristics, scattering characteristics, etc., can solve the problems of lack of absorption peak and refractive index peak, single detection method, lack of quantitative analysis method, etc., to improve the extraction effect, Reasonable effect

Inactive Publication Date: 2017-07-28
TIANJIN UNIV
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  • Application Information

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Problems solved by technology

The detection method is relatively simple; the absorption coefficient and refractive index spectrum of oil products in the terahertz band lack absorption peaks and refractive index peaks, and the detection effect is limited; the quantitative analysis method based on the terahertz optical rotation of oil products is missing

Method used

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  • Method for detecting mixed oil on basis of terahertz optical rotation effects
  • Method for detecting mixed oil on basis of terahertz optical rotation effects
  • Method for detecting mixed oil on basis of terahertz optical rotation effects

Examples

Experimental program
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Effect test

Embodiment 1

[0046] A method for detecting mixed oil based on the terahertz optical rotation effect, see figure 1 , the mixed oil detection method comprises the following steps:

[0047] 101: The terahertz wave emitted by the transmitting antenna passes through the cuvette of the sample to be tested, passes through the terahertz polarizer, and is received on the receiving antenna;

[0048] 102: Measure the terahertz time-domain spectrum using the method of slow stepping and precise scanning;

[0049] 103: Rotate the wedge-shaped bracket of the terahertz polarizer base to the initial position of 0°, place the receiving antenna and the transmitting antenna in the same direction of polarization, and select the terahertz p-polarized wave transmission sample; save the test data as the reference signal for detection;

[0050]104: Using a terahertz polarizer, obtain the time-domain waveform of each sample at a series of angles of the terahertz polarizer; extract the pulse amplitude, and perform ...

Embodiment 2

[0062] The following combines specific Figure 2-Figure 6 , and calculation formula, example, table 1 are further introduced to the scheme in embodiment 1, see the following description for details:

[0063] 201: Set the detection optical path so that the terahertz wave emitted by the transmitting antenna first passes through the cuvette of the sample to be detected, then passes through the terahertz polarizer, and is finally received on the receiving antenna;

[0064] The detailed operation of this step is:

[0065] figure 2 It is the detection light path structure diagram. Among them, Laser is a femtosecond laser, which emits femtosecond pulses. The beam splitting prism in the optical path divides the pulses into two beams: one beam is the excitation pulse, which is sent to the transmitting antenna Tx to generate THz radiation; the other beam In order to detect the pulse, hit the receiving antenna Rx to detect the THz pulse waveform. Two lenses are used between Tx and R...

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Abstract

The invention discloses a method for detecting mixed oil on the basis of terahertz optical rotation effects. The method includes allowing terahertz waves transmitted by transmitting antennas to penetrate cuvettes for to-be-detected samples and pass terahertz polarizers and receiving the terahertz waves on receiving antennas; measuring terahertz time-domain optical spectra by the aid of slow stepping precision scanning processes; allowing wedge-shaped supports of bases of the terahertz polarizers to rotate to reach initial locations at 0-degree angles, arranging the receiving antennas and the transmitting antennas to allow the polarization directions of the receiving antennas and the transmitting antennas to be located in the same directions, and selecting terahertz p polarized wave transmission samples; acquiring time-domain waveforms of each sample at a series of angles of the terahertz polarizers by the aid of the terahertz polarizers; extracting pulse amplitude values and carrying out sine curve fitting processing; extracting phases of fitted sine curves of each sample and acquiring the optical rotation of each sample by the aid of the phases. The method has the advantages that optical rotary power of the product oil samples of gasoline and diesel and mixed solution of the product oil samples can be detected, and the types of oil products can be identified and detected by the aid of difference of the terahertz wave optical rotary power of the product oil samples and the mixed solution.

Description

technical field [0001] The invention relates to the field of mixed oil detection, in particular to a method for detecting mixed oil based on the terahertz optical rotation effect. Background technique [0002] The detection and analysis of oil components has important economic and safety significance. For the daily production and refining process of petroleum companies, accurate detection of oil components can play a key role in ensuring product quality and supervising the production process. During the transportation of pipeline oil products, it is even more necessary to test the oil products transported in the pipeline. In order to improve the utilization rate and transportation efficiency of transportation, domestic and foreign refined oil pipeline transportation usually makes different types of refined oil alternately transported in the same pipeline, that is, the sequential transportation of refined oil is adopted. Diffusion forms a mixed oil section. If the oil-mixi...

Claims

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Application Information

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IPC IPC(8): G01N21/35G01N21/47
Inventor 周南李健李萍闫骥曾周末
Owner TIANJIN UNIV
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